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2. Snorkel (swimming) - Wikipedia

   en.wikipedia.org/wiki/Snorkel_(swimming)

   A model enclosing the eyes and the nose only. A permanent single snorkel emerges from the top of the mask and terminates above with a ball float shut-off valve. B. A model with a chinpiece to enclose the eyes, the nose and the mouth. Permanent twin snorkels emerge from either side of the mask and terminate above with "gamma" shut-off valves. C.

3. Diving regulator - Wikipedia

   en.wikipedia.org/wiki/Diving_regulator

   When a second stage upstream valve is used a relief valve will be included by the manufacturer on the first stage regulator to protect the hose. [3]: 9 If a shut-off valve is fitted between the first and second stages, as is found on scuba bailout systems used for commercial diving and in some technical diving configurations, the demand valve ...

4. Garden hose - Wikipedia

   en.wikipedia.org/wiki/Garden_hose

   This is an internal valve which is shut off by water pressure, and it is opened only by connecting a fitting or appliance; thus, disconnecting a hose fitted with this adaptor will automatically stop the flow of water. This eases connecting and changing appliances without the need to shut off the water first.

5. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes

6. Tap (valve) - Wikipedia

   en.wikipedia.org/wiki/Tap_(valve)

   Cone valves or ball valves are another alternative. These are commonly found as the service shut-off valves in more-expensive water systems and usually found in gas taps (and, incidentally, the cask beer taps referred to above). They can be identified by their range of motion—only 90°—between fully open and closed.

7. Gasoline pump - Wikipedia

   en.wikipedia.org/wiki/Gasoline_pump

   A breakaway valve is also fitted to the hose so that the nozzle and hose will detach and fuel flow will stop if a motorist drives off with the nozzle still in the filler. Nozzles are usually color-coded to indicate which grade of fuel they dispense, but the color-coding differs between countries and even retailers.